Merge pull request 'Modernize kosmos-mediawiki cookbook' (#600) from feature/500-chef_upgrade_mediawiki into master

Reviewed-on: #600
Reviewed-by: Râu Cao <raucao@kosmos.org>

nodes/wiki-1.json

@@ -28,6 +28,7 @@
       "timezone_iii::debian",
       "ntp::default",
       "ntp::apparmor",
+      "kosmos-base::journald_conf",
       "kosmos-base::systemd_emails",
       "apt::unattended-upgrades",
       "kosmos-base::firewall",
@@ -66,12 +67,13 @@
     "cloud": null,
     "chef_packages": {
       "chef": {
-        "version": "15.13.8",
-        "chef_root": "/opt/chef/embedded/lib/ruby/gems/2.6.0/gems/chef-15.13.8/lib"
+        "version": "18.7.10",
+        "chef_root": "/opt/chef/embedded/lib/ruby/gems/3.1.0/gems/chef-18.7.10/lib",
+        "chef_effortless": null
       },
       "ohai": {
-        "version": "15.12.0",
-        "ohai_root": "/opt/chef/embedded/lib/ruby/gems/2.6.0/gems/ohai-15.12.0/lib/ohai"
+        "version": "18.2.5",
+        "ohai_root": "/opt/chef/embedded/lib/ruby/gems/3.1.0/gems/ohai-18.2.5/lib/ohai"
       }
     }
   },